"Jeff Liebermann" wrote in message
...


Major snippage

Arnold Wilkins recalled
that it was possible to detect an airplane when it created multipath
interference patterns as the airplane flew between the transmitter and
receiver. A field test was arranged, it worked, and the rest it
history.

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I recall an article in an electronics magazine about an aircraft detection
system that worked that way. It was tested in Maryland using the area's TV
station signals.

http://users.ece.gatech.edu/lanterma...ultistatic.pdf

Wikipedia has an article called "Passive Radar."

"Sal"